Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f59b32d7620f23a…

MALICIOUS

PDF

80.3 KB Created: 2021-04-03 19:44:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 901e45581186988a9afa0a5ef4258f88 SHA-1: 6ff7655ab1b7a9c3f31406b0c48d4cf919df14f4 SHA-256: 2f59b32d7620f23addc7ed7dc829c2f30d78c46decb4c1995fc85b27cdbae47a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity, potentially leveraging embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://pelibifir.ru/award?keyword=antiarritmicos+anestesiologia+pdf PDF link annotation
    • http://nutitoku.22web.org/canon_piano_sheet_music_easy.pdfIn PDF document text
    • http://tixanijematewe.mypressonline.com/poliarteritis_nodosa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482671/normal_5ffa2656a6680.pdfIn PDF document text
    • https://muwevowaxa.weebly.com/uploads/1/3/5/9/135992822/mijapikowo.pdfIn PDF document text
    • http://zikevamakag.mygamesonline.org/kepudotogafepukuboribenag.pdfIn PDF document text
    • http://zosujisa.22web.org/assistive_technology_in_the_classroom_2nd_edition.pdfIn PDF document text
    • http://puditefifu.22web.org/kexefovirawabavim.pdfIn PDF document text
    • http://premium-cinema.com/pharmacology_made_easy_4.0_infectionwpdie.pdfIn PDF document text
    • http://fuxisileza.mywebcommunity.org/psicomagia_alejandro_jodorowsky_italiano.pdfIn PDF document text
    • http://bumaga.bz/86685032680t7drs.pdfIn PDF document text
    • http://bupro.asia/54484186436ekj3w.pdfIn PDF document text
    • http://mybiol.site/why_is_my_bathroom_sink_leaking_at_the_basec8w7l.pdfIn PDF document text
    • http://janorewaxeno.mygamesonline.org/51832632258.pdfIn PDF document text
    • https://xinelonaveguv.weebly.com/uploads/1/3/4/6/134606197/gikirazeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452599/normal_6043683585be5.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9f503c4c-bf14-4dcb-9a7a-68e0e5bb3568.filesusr.com/ugd/8ac1ab_55c8e95316e04cf886445edfcee9b702.pdf?index=trueIn PDF document text
    • http://vefodipox.myartsonline.com/foxit_reader_typewriter_not_working.pdfIn PDF document text
    • https://b01ec662-dec5-4f54-b977-8708717d6054.filesusr.com/ugd/07e02c_ae0f50d423ef4b6fa7b2bed259cd8c20.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBA 1684 bytes
SHA-256: 8b69ad8bf8706a8de8604f0485c67fb25a23b24d50174afbb8bbf061f3c53837
font_01_sfnt_off0000f81e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81E 5464 bytes
SHA-256: 403e4c6c8adcfa12e1901aafe84785272f07d56fc6469604d70f87ebb3979080
font_02_sfnt_off00010a9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9E 12328 bytes
SHA-256: da6ad6e25ad78944a2d6350715cc2b8f3006cd8c68a705a4dcd76916c781dd22

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